In Fig. REF , cross-sections of the normalized electric field Bloch mode intensity \(|E(r)|^2\) , as well as the associated \(S_3(r)\) , are plotted for the initial design in (a) and (c), and the new design in (b) and (d); these plots are all taken at the center of the slab thickness. The Bloch modes show that the field is well confined to the interface for both designs, and there is reasonable overlap with the chiral points, which can be exploited for unidirectional single photon
emission [1]}, [2]}
